{"id":"CVE-2026-53666","aliases":["CLSA-2026-1784856210","CLSA-2026-1787668126","CLSA-2026-1789159895","CLSA-2026-1791465168","CLSA-2026-1792191744","CLSA-2026-1792253402","CLSA-2026-1792253408","CLSA-2026-1792253416","CLSA-2026-1792269434","CLSA-2026-1792419111","CLSA-2026-1792419188","CLSA-2026-1792419267","CLSA-2026-1792421941","CLSA-2026-1792424730","CLSA-2026-1792425405","CLSA-2026-1792428107","CLSA-2026-1792430030","CLSA-2026-1792840526","CLSA-2026-1793099986","CLSA-2026-1793102180","EUVD-2026-49628","GHSA-337j-9hxr-rhxg","ROOT-APP-NPM-CVE-2026-53666"],"status":"published","title":"React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration","description":"React Router is a router for React. 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This issue has been fixed in version 7.18.0.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0042,"percentile":0.36687,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-470"],"published":"2026-07-23T19:34:14Z","modified":"2026-11-10T19:45:13Z","fixes":[{"ecosystem":"npm","package":"react-router","fixed_in":["7.18.0"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:npm","package":"react-router","fixed_in":["6.30.3-tuxcare.2"],"sources":["osv"]},{"ecosystem":"TuxCare:npm","package":"react-router-dom-v5-compat","fixed_in":["6.30.3-tuxcare.2"],"sources":["osv"]},{"ecosystem":"TuxCare:npm","package":"react-router-dom","fixed_in":["6.30.3-tuxcare.2"],"sources":["osv"]},{"ecosystem":"TuxCare:npm","package":"react-router-native","fixed_in":["6.30.3-tuxcare.2"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"react-router","fixed_in":["7.18.0-aikido.1"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"@rootio/react-router","fixed_in":["7.18.0-root.io.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"react-router","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.4.0"},{"fixed":"7.18.0"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.5.1-tuxcare.0"},{"fixed":"7.5.1-tuxcare.5"}]}],"versions":["7.5.1","7.5.1-tuxcare.1","7.5.1-tuxcare.2","7.5.1-tuxcare.3","7.5.1-tuxcare.4"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.30.4-tuxcare.0"},{"fixed":"6.30.4-tuxcare.1"}]}],"versions":["6.30.4"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router-dom-v5-compat","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.30.4-tuxcare.0"},{"fixed":"6.30.4-tuxcare.1"}]}],"versions":["6.30.4"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.30.3-tuxcare.0"},{"fixed":"6.30.3-tuxcare.2"}]}],"versions":["6.30.3","6.30.3-tuxcare.1"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router-dom-v5-compat","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.30.3-tuxcare.0"},{"fixed":"6.30.3-tuxcare.2"}]}],"versions":["6.30.3","6.30.3-tuxcare.1"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.15.0-tuxcare.0"},{"fixed":"7.15.0-tuxcare.1"}]}],"versions":["7.15.0"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.14.2-tuxcare.0"},{"fixed":"7.14.2-tuxcare.1"}]}],"versions":["7.14.2"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router-dom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.15.0-tuxcare.0"},{"fixed":"7.15.0-tuxcare.1"}]}],"versions":["7.15.0"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router-dom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.30.3-tuxcare.0"},{"fixed":"6.30.3-tuxcare.2"}]}],"versions":["6.30.3","6.30.3-tuxcare.1"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router-dom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.14.2-tuxcare.0"},{"fixed":"7.14.2-tuxcare.1"}]}],"versions":["7.14.2"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-router-native","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.30.3-tuxcare.0"},{"fixed":"6.30.3-tuxcare.2"}]}],"versions":["6.30.3","6.30.3-tuxcare.1"]},{"source":"osv","ecosystem":"TuxCare:npm","package":"@react-router/architect","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.5.1-tuxcare.0"},{"fixed":"7.5.1-tuxcare.5"}]}],"versions":["7.5.1","7.5.1-tuxcare.1","7.5.1-tuxcare.4"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:npm","package":"@react-router/cloudflare","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.5.1-tuxcare.0"},{"fixed":"7.5.1-tuxcare.5"}]}],"versions":["7.5.1","7.5.1-tuxcare.1","7.5.1-tuxcare.4"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:npm","package":"@react-router/express","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.5.1-tuxcare.0"},{"fixed":"7.5.1-tuxcare.5"}]}],"versions":["7.5.1","7.5.1-tuxcare.1","7.5.1-tuxcare.4"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:npm","package":"@react-router/remix-routes-option-adapter","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.5.1-tuxcare.0"},{"fixed":"7.5.1-tuxcare.5"}]}],"versions":["7.5.1","7.5.1-tuxcare.1","7.5.1-tuxcare.4"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:npm","package":"@react-router/dev","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.5.1-tuxcare.0"},{"fixed":"7.5.1-tuxcare.5"}]}],"versions":["7.5.1","7.5.1-tuxcare.1","7.5.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Party Advisory","advisory","web"]},{"url":"https://github.com/remix-run/react-router/pull/15175","tags":["x_refsource_MISC","Issue Tracking","Patch","fix","web"]},{"url":"https://github.com/remix-run/react-router/commit/9d22943fd46c8ae4b08236425fa3549e10e9ad1a","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://github.com/advisories/GHSA-337j-9hxr-rhxg"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53666.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53666","tags":["advisory"]},{"url":"https://github.com/remix-run/react-router","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-53666","title":"React Router: Arbitrary Constructor Injection 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In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.","status":"published","published":"2026-07-27T21:14:49.547Z","modified":"2026-07-28T15:19:58.603Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-470"],"updated_at":"2026-11-02T14:20:00.11477Z"}],"euvd":[{"id":"EUVD-2026-49628","description":"React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.","status":"published","published":"2026-07-27T21:14:49Z","modified":"2026-07-28T15:19:58Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T18:02:31.399718Z"}],"ghsa":[{"id":"GHSA-337j-9hxr-rhxg","title":"React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration","description":"If application code allows attacker supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for attacker to trigger unexpected constructor execution on the client which would trigger outbound network traffic.  This is only possible with very specific (and unlikely) application layer code.\n\n\u003e [!NOTE]\n\u003e This does not impact your application if you are using Declarative Mode.  This only impacts Framework Mode and Data Mode applications doing manual SSR/hydration","status":"published","published":"2026-07-23T19:34:14Z","modified":"2026-07-23T19:34:16Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-470"],"updated_at":"2026-11-02T14:40:52.46233Z"}],"nvd":[{"id":"CVE-2026-53666","description":"React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.","status":"published","published":"2026-07-27T22:17:30.937Z","modified":"2026-10-24T13:10:00.147Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-470"],"updated_at":"2026-11-02T14:12:33.249634Z"}],"osv":[{"id":"CVE-2026-53666","title":"React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration","description":"React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.","status":"published","published":"2026-07-27T21:14:49.547Z","modified":"2026-10-28T02:30:30.612878542Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-470"],"updated_at":"2026-11-02T15:45:08.132336Z"},{"id":"GHSA-337j-9hxr-rhxg","title":"React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration","description":"If application code allows attacker supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for attacker to trigger unexpected constructor execution on the client which would trigger outbound network traffic.  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Fixed in 7.5.1-tuxcare.5.","status":"published","published":"2026-10-19T15:56:44Z","modified":"2026-10-19T19:15:12.328827247Z","updated_at":"2026-11-02T15:43:54.119956Z"},{"id":"CLSA-2026-1792428107","title":"TuxCare security update for @react-router/serve (3 CVEs)","description":"TuxCare rebuilt @react-router/serve to address 3 CVEs. Fixed in 7.5.1-tuxcare.5.","status":"published","published":"2026-10-19T16:41:46Z","modified":"2026-10-19T19:15:22.077729358Z","updated_at":"2026-11-02T15:43:54.119956Z"},{"id":"CLSA-2026-1792430030","title":"TuxCare security update for create-react-router (3 CVEs)","description":"TuxCare rebuilt create-react-router to address 3 CVEs. Fixed in 7.5.1-tuxcare.5.","status":"published","published":"2026-10-19T17:13:49Z","modified":"2026-10-19T19:15:22.934222328Z","updated_at":"2026-11-02T15:43:54.119956Z"},{"id":"CLSA-2026-1792840526","title":"TuxCare security update for @remix-run/router (3 CVEs)","description":"TuxCare rebuilt @remix-run/router to address 3 CVEs. Fixed in 1.23.3-tuxcare.1.","status":"published","published":"2026-10-24T11:15:26Z","modified":"2026-10-24T13:30:02.662597028Z","updated_at":"2026-11-02T15:43:54.981307Z"},{"id":"CLSA-2026-1793099986","title":"TuxCare security update for react-router (3 CVEs)","description":"TuxCare rebuilt react-router to address 3 CVEs. Fixed in 7.14.1-tuxcare.2.","status":"published","published":"2026-10-27T11:19:46Z","modified":"2026-11-06T13:28:04.081316576Z","updated_at":"2026-11-06T13:44:09.891978Z"},{"id":"CLSA-2026-1793102180","title":"TuxCare security update for react-router (5 CVEs)","description":"TuxCare rebuilt react-router to address 5 CVEs. Fixed in 7.13.1-tuxcare.2.","status":"published","published":"2026-10-27T11:56:20Z","modified":"2026-11-06T13:28:06.223566287Z","updated_at":"2026-11-06T13:44:09.891978Z"},{"id":"ROOT-APP-NPM-CVE-2026-53666","title":"CVE-2026-53666 in react-router - Patched by Root","description":"Root has patched CVE-2026-53666 in the react-router package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-08-11T12:47:31Z","modified":"2026-08-11T13:30:03.359016109Z","updated_at":"2026-11-02T15:53:27.649662Z"}]}}
